package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements com.sky.service.ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());


        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        //判断当前商品是否在购物车中
        if(shoppingCartList!=null && shoppingCartList.size()==1){

            //如果已存在，就更新数量，数量加1,调用shoppingCartMapper修改数量
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);

        }else{
            //如果不存在，插入数据，数量为一

            //判断当前添加到购物车里的是菜品还是套餐
            if(shoppingCartDTO.getDishId() !=null){

                Dish dish = dishMapper.getById(shoppingCartDTO.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{

                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            //插入数据
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanAll() {
        shoppingCartMapper.cleanAllByUserId(BaseContext.getCurrentId());

    }

    /**
     * 删除购物车里一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void deleteByGoodsId(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list!=null && list.size()>0){
            shoppingCart = list.get(0);//注意一定要更新shoppingCart，不要list.get(0).getNumber()
            Integer number = shoppingCart.getNumber();

            if(number==1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());

            }else{
                //当前商品在购物车中的份数大于1，修改份数即可
                shoppingCart.setNumber(number-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }

        }


    }
}
